Extracting fundamental transverse mode operation in broad area quantum cascade lasers

Kaspi, R.; Luong, S.; Yang, Chi; Lu, Chunte A.; Newell, T.C.; Bate, Timothy

doi:10.1063/1.4968800

Cited by 13 publications

(4 citation statements)

References 16 publications

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“…Extending the width of the cavity by such an extent will necessarily lead to high order transverse mode operation and a highly divergent, dual lobed far field profile. To maintain beam quality in an ultrawide architecture, the waveguide must be altered with strategically placed optical losses to induce a single lobed far field output [4]. As higher order transverse modes have greater overlap with the edges of Fabry-Perot-like waveguides, the losses should be greater near the edges and reduced near the center to improve mode quality.…”

Section: Ultrawide Dual Cotnact Strip Designmentioning

confidence: 99%

Improving transverse mode quality of broad area quantum cascade lasers

Suttinger,

Go,

2024

Novel in-Plane Semiconductor Lasers XXIII

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Results of novel broad area QCL waveguides fabricated at Air Force Research Laboratory are discussed. An "ultrawide" Fabry-Perot waveguide design is modified to bring the waveguide mode closer to the electrical contact and splitting said contact into a Dual Contact Strip. The mode quality in the fabricated ultrawide device is rectified to fundamental-like behavior. Overlapped angled cavity waveguides with a low tilt angle, interrupted with "notches" etched out of areas far from the internal beam path of the fundamental mode, are designed and fabricated. The beam quality of the overlapped angled cavity array demonstrates coherence between outputs.

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Section: Ultrawide Dual Cotnact Strip Designmentioning

confidence: 99%

Improving transverse mode quality of broad area quantum cascade lasers

Suttinger,

Go,

2024

Novel in-Plane Semiconductor Lasers XXIII

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“…Weakly-guided devices, such as broad area lasers with lateral-mode filtering [104,105], tapered lasers [106,107], Master Oscillator Power Amplifiers (MOPAs) [108,109], angled-facet waveguide devices [110,111] and PC lasers with weakly index-guided structures such as diffraction gratings (i.e., PC-DFB lasers) [112,113] have all been used to provide a higher degree of spatial coherence compared with multi-mode, wide-ridge lasers under low-duty cycle pulsed-current operation. However, as device selfheating becomes important under QCW/CW operation, thermally induced index perturbations can destabilize the optical mode in those weakly-guided structures.…”

Section: 2mentioning

confidence: 99%

High-Power Mid-Infrared (λ∼3-6 μm) Quantum Cascade Lasers

Mawst

Botez

2022

IEEE Photonics J.

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The performances of mid-infrared (IR) quantum cascade lasers (QCLs) are now reaching a maturity level that enables a variety of applications which require compact laser sources capable of watt-range output powers with high beam quality. We review the fundamental design issues and current performance limitations, focusing on InGaAs/AlInAs/InP QCLs with emission in the 3-6 m wavelength range. Metamorphic materials broaden the available compositions for accessing short emission wavelengths (≤3.5 m) or for integration with GaAs-and Si-photonics platforms. Conductionband engineering through the use of varying compositions throughout the active-region structure has been utilized to achieve the highest performance levels to date. Interface roughness scattering plays a dominant role in determining both the lower-laser-level lifetime as well as the carrier-leakage current. Numerous approaches have been implemented in attempts to control, scale, and stabilize the spatial mode to high output powers. Of all approaches photonic-crystal structures with high built-in index contrast, thus capable of maintaining modal properties under strong self-heating, are the most promising device configuration for achieving single-spatial-mode, single-lobe reliable CW operation to multiwattrange power levels. Such devices have demonstrated to date > 5W front-facet output powers with diffraction-limited beams in shortpulse operation.

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“…Introducing mode filters is another effective approach for inducing additional losses specifically targeting high-order modes. Examples of such mode filters include tapered lasers, phase structures, external cavity configurations, tilted waveguides, microstructures, and inhomogeneous waveguides [14], [15], [16], [17], [18], [19], [20], [21]. However, these methods are subject to limitations, as they often come at the cost of decreased output power or require complex designs, which restrict their practical applicability.…”

Section: Introductionmentioning

confidence: 99%

Improved Far-Field Angle in Narrow-Ridge High-Power Laser Diodes Using a Double Stripe Structure

Kim,

Yang,

Choi

et al. 2023

IEEE Photonics J.

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We propose a novel double stripe structure for achieving a narrow far-field angle without significant output power loss in narrow-ridge high-power broad-area laser diodes. By introducing double SiO2 stripes on the top side of the laser diode, we effectively suppress high-order modes through mode weight engineering. Through self-consistent electro-thermaloptical simulations powered by LASTIP with the well-verified model from the reference, we comprehensively analyze and compare the characteristics of high-power broad-area laser diodes utilizing the loss tailoring technique that adopted the much simpler structure compared to prior study and our proposed structure. Our results demonstrate a significant reduction of approximately 36% in the far-field angle while maintaining slope efficiency. This approach shows promise for enhancing the performance of coupling efficiency between narrow-ridge highpower laser diodes and fibers.

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Extracting fundamental transverse mode operation in broad area quantum cascade lasers

Cited by 13 publications

References 16 publications

Improving transverse mode quality of broad area quantum cascade lasers

Improving transverse mode quality of broad area quantum cascade lasers

High-Power Mid-Infrared (λ∼3-6 μm) Quantum Cascade Lasers

Improved Far-Field Angle in Narrow-Ridge High-Power Laser Diodes Using a Double Stripe Structure

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